In Kutter's defense, around the time you start your sample, Kutter closes in on his career high in IP. A falloff is kind of expected at that point.
Kutter through 29 starts:
161 IP, 4.08 ERA, 149 K, 44 BB, 4.63 FIP
Bello full season (30 starts):
162.1 IP, 4.49 ERA, 153 K, 64 BB, 4.19 FIP
Post ASB:
Kutter 4 QS
Bello 5 QS
It's very close, but my worry is about Bello's bb rate (7th highest for pitchers with IP > 150 in 2024). Crawford's HR/9 was astronomical, but I believe that number is less elastic than bb rate.